int
udp_input(struct mbuf **mp, int *offp, int proto)
{
struct sockaddr_in udp_in = { sizeof udp_in, AF_INET };
int iphlen;
struct ip *ip;
struct udphdr *uh;
struct inpcb *inp;
struct mbuf *m;
struct mbuf *opts = NULL;
int len, off;
struct ip save_ip;
struct inpcbinfo *pcbinfo = &udbinfo[mycpuid];
off = *offp;
m = *mp;
*mp = NULL;
iphlen = off;
udp_stat.udps_ipackets++;
/*
* Strip IP options, if any; should skip this,
* make available to user, and use on returned packets,
* but we don't yet have a way to check the checksum
* with options still present.
*/
if (iphlen > sizeof(struct ip)) {
ip_stripoptions(m);
iphlen = sizeof(struct ip);
}
/*
* IP and UDP headers are together in first mbuf.
* Already checked and pulled up in ip_demux().
*/
KASSERT(m->m_len >= iphlen + sizeof(struct udphdr),
("UDP header not in one mbuf"));
ip = mtod(m, struct ip *);
uh = (struct udphdr *)((caddr_t)ip + iphlen);
/* destination port of 0 is illegal, based on RFC768. */
if (uh->uh_dport == 0)
goto bad;
/*
* Make mbuf data length reflect UDP length.
* If not enough data to reflect UDP length, drop.
*/
len = ntohs((u_short)uh->uh_ulen);
if (ip->ip_len != len) {
if (len > ip->ip_len || len < sizeof(struct udphdr)) {
udp_stat.udps_badlen++;
goto bad;
}
m_adj(m, len - ip->ip_len);
/* ip->ip_len = len; */
}
/*
* Save a copy of the IP header in case we want restore it
* for sending an ICMP error message in response.
*/
save_ip = *ip;
/*
* Checksum extended UDP header and data.
*/
if (uh->uh_sum) {
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
uh->uh_sum = m->m_pkthdr.csum_data;
else
uh->uh_sum = in_pseudo(ip->ip_src.s_addr,
ip->ip_dst.s_addr, htonl((u_short)len +
m->m_pkthdr.csum_data + IPPROTO_UDP));
uh->uh_sum ^= 0xffff;
} else {
char b[9];
bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
bzero(((struct ipovly *)ip)->ih_x1, 9);
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
uh->uh_sum = in_cksum(m, len + sizeof(struct ip));
bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
}
if (uh->uh_sum) {
udp_stat.udps_badsum++;
m_freem(m);
return(IPPROTO_DONE);
}
} else
udp_stat.udps_nosum++;
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
struct inpcbhead *connhead;
struct inpcontainer *ic, *ic_marker;
struct inpcontainerhead *ichead;
struct udp_mcast_arg arg;
struct inpcb *last;
int error;
/*
* Deliver a multicast or broadcast datagram to *all* sockets
* for which the local and remote addresses and ports match
* those of the incoming datagram. This allows more than
* one process to receive multi/broadcasts on the same port.
* (This really ought to be done for unicast datagrams as
* well, but that would cause problems with existing
* applications that open both address-specific sockets and
* a wildcard socket listening to the same port -- they would
* end up receiving duplicates of every unicast datagram.
* Those applications open the multiple sockets to overcome an
* inadequacy of the UDP socket interface, but for backwards
* compatibility we avoid the problem here rather than
* fixing the interface. Maybe 4.5BSD will remedy this?)
*/
/*
* Construct sockaddr format source address.
*/
udp_in.sin_port = uh->uh_sport;
udp_in.sin_addr = ip->ip_src;
arg.udp_in = &udp_in;
/*
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*/
last = NULL;
arg.iphlen = iphlen;
connhead = &pcbinfo->hashbase[
INP_PCBCONNHASH(ip->ip_src.s_addr, uh->uh_sport,
ip->ip_dst.s_addr, uh->uh_dport, pcbinfo->hashmask)];
LIST_FOREACH(inp, connhead, inp_hash) {
#ifdef INET6
if (!INP_ISIPV4(inp))
continue;
#endif
if (!in_hosteq(inp->inp_faddr, ip->ip_src) ||
!in_hosteq(inp->inp_laddr, ip->ip_dst) ||
inp->inp_fport != uh->uh_sport ||
inp->inp_lport != uh->uh_dport)
continue;
arg.inp = inp;
arg.last = last;
arg.ip = ip;
arg.m = m;
error = udp_mcast_input(&arg);
if (error == ERESTART)
continue;
last = arg.last;
if (error == EJUSTRETURN)
goto done;
}
ichead = &pcbinfo->wildcardhashbase[
INP_PCBWILDCARDHASH(uh->uh_dport,
pcbinfo->wildcardhashmask)];
ic_marker = in_pcbcontainer_marker(mycpuid);
GET_PCBINFO_TOKEN(pcbinfo);
LIST_INSERT_HEAD(ichead, ic_marker, ic_list);
while ((ic = LIST_NEXT(ic_marker, ic_list)) != NULL) {
LIST_REMOVE(ic_marker, ic_list);
LIST_INSERT_AFTER(ic, ic_marker, ic_list);
inp = ic->ic_inp;
if (inp->inp_flags & INP_PLACEMARKER)
continue;
#ifdef INET6
if (!INP_ISIPV4(inp))
continue;
#endif
if (inp->inp_lport != uh->uh_dport)
continue;
if (inp->inp_laddr.s_addr != INADDR_ANY &&
inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
continue;
arg.inp = inp;
arg.last = last;
arg.ip = ip;
arg.m = m;
error = udp_mcast_input(&arg);
if (error == ERESTART)
continue;
last = arg.last;
if (error == EJUSTRETURN)
break;
}
LIST_REMOVE(ic_marker, ic_list);
REL_PCBINFO_TOKEN(pcbinfo);
done:
if (last == NULL) {
/*
* No matching pcb found; discard datagram.
* (No need to send an ICMP Port Unreachable
* for a broadcast or multicast datgram.)
*/
udp_stat.udps_noportbcast++;
goto bad;
}
#ifdef IPSEC
/* check AH/ESP integrity. */
if (ipsec4_in_reject_so(m, last->inp_socket)) {
ipsecstat.in_polvio++;
goto bad;
}
#endif /*IPSEC*/
#ifdef FAST_IPSEC
/* check AH/ESP integrity. */
if (ipsec4_in_reject(m, last))
goto bad;
#endif /*FAST_IPSEC*/
udp_append(last, ip, m, iphlen + sizeof(struct udphdr),
&udp_in);
return(IPPROTO_DONE);
}
/*
* Locate pcb for datagram.
*/
inp = in_pcblookup_pkthash(pcbinfo, ip->ip_src, uh->uh_sport,
ip->ip_dst, uh->uh_dport, TRUE, m->m_pkthdr.rcvif,
udp_reuseport_ext ? m : NULL);
if (inp == NULL) {
if (log_in_vain) {
char buf[sizeof "aaa.bbb.ccc.ddd"];
strcpy(buf, inet_ntoa(ip->ip_dst));
log(LOG_INFO,
"Connection attempt to UDP %s:%d from %s:%d\n",
buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src),
ntohs(uh->uh_sport));
}
udp_stat.udps_noport++;
if (m->m_flags & (M_BCAST | M_MCAST)) {
udp_stat.udps_noportbcast++;
goto bad;
}
if (blackhole)
goto bad;
#ifdef ICMP_BANDLIM
if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
goto bad;
#endif
*ip = save_ip;
ip->ip_len += iphlen;
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
return(IPPROTO_DONE);
}
KASSERT(INP_ISIPV4(inp), ("not inet inpcb"));
#ifdef IPSEC
if (ipsec4_in_reject_so(m, inp->inp_socket)) {
ipsecstat.in_polvio++;
goto bad;
}
#endif /*IPSEC*/
#ifdef FAST_IPSEC
if (ipsec4_in_reject(m, inp))
goto bad;
#endif /*FAST_IPSEC*/
/*
* Check the minimum TTL for socket.
*/
if (ip->ip_ttl < inp->inp_ip_minttl)
goto bad;
/*
* Construct sockaddr format source address.
* Stuff source address and datagram in user buffer.
*/
udp_in.sin_port = uh->uh_sport;
udp_in.sin_addr = ip->ip_src;
if ((inp->inp_flags & INP_CONTROLOPTS) ||
(inp->inp_socket->so_options & SO_TIMESTAMP))
ip_savecontrol(inp, &opts, ip, m);
m_adj(m, iphlen + sizeof(struct udphdr));
lwkt_gettoken(&inp->inp_socket->so_rcv.ssb_token);
if (ssb_appendaddr(&inp->inp_socket->so_rcv,
(struct sockaddr *)&udp_in, m, opts) == 0) {
lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
udp_stat.udps_fullsock++;
goto bad;
}
lwkt_reltoken(&inp->inp_socket->so_rcv.ssb_token);
sorwakeup(inp->inp_socket);
return(IPPROTO_DONE);
bad:
m_freem(m);
if (opts)
m_freem(opts);
return(IPPROTO_DONE);
}
/*
* The output routine. Takes a packet and encapsulates it in the protocol
* given by sc->g_proto. See also RFC 1701 and RFC 2004
*/
static int
gre_output_serialized(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
int error = 0;
struct gre_softc *sc = ifp->if_softc;
struct greip *gh;
struct ip *ip;
u_short etype = 0;
struct mobile_h mob_h;
struct route *ro;
struct sockaddr_in *ro_dst;
ASSERT_NETISR_NCPUS(mycpuid);
/*
* gre may cause infinite recursion calls when misconfigured.
* We'll prevent this by introducing upper limit.
*/
if (++(sc->called) > max_gre_nesting) {
kprintf("%s: gre_output: recursively called too many "
"times(%d)\n", if_name(&sc->sc_if), sc->called);
m_freem(m);
error = EIO; /* is there better errno? */
goto end;
}
if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) == 0 ||
sc->g_src.s_addr == INADDR_ANY || sc->g_dst.s_addr == INADDR_ANY) {
m_freem(m);
error = ENETDOWN;
goto end;
}
ro = &sc->route_pcpu[mycpuid];
ro_dst = (struct sockaddr_in *)&ro->ro_dst;
if (ro->ro_rt != NULL &&
((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
ro_dst->sin_addr.s_addr != sc->g_dst.s_addr)) {
RTFREE(ro->ro_rt);
ro->ro_rt = NULL;
}
if (ro->ro_rt == NULL) {
error = gre_compute_route(sc, ro);
if (error) {
m_freem(m);
goto end;
}
}
gh = NULL;
ip = NULL;
if (ifp->if_bpf) {
bpf_gettoken();
if (ifp->if_bpf) {
uint32_t af = dst->sa_family;
bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
}
bpf_reltoken();
}
m->m_flags &= ~(M_BCAST|M_MCAST);
if (sc->g_proto == IPPROTO_MOBILE) {
if (dst->sa_family == AF_INET) {
struct mbuf *m0;
int msiz;
ip = mtod(m, struct ip *);
/*
* RFC2004 specifies that fragmented datagrams shouldn't
* be encapsulated.
*/
if (ip->ip_off & (IP_MF | IP_OFFMASK)) {
m_freem(m);
error = EINVAL; /* is there better errno? */
goto end;
}
memset(&mob_h, 0, MOB_H_SIZ_L);
mob_h.proto = (ip->ip_p) << 8;
mob_h.odst = ip->ip_dst.s_addr;
ip->ip_dst.s_addr = sc->g_dst.s_addr;
/*
* If the packet comes from our host, we only change
* the destination address in the IP header.
* Else we also need to save and change the source
*/
if (in_hosteq(ip->ip_src, sc->g_src)) {
msiz = MOB_H_SIZ_S;
} else {
mob_h.proto |= MOB_H_SBIT;
mob_h.osrc = ip->ip_src.s_addr;
ip->ip_src.s_addr = sc->g_src.s_addr;
msiz = MOB_H_SIZ_L;
}
mob_h.proto = htons(mob_h.proto);
mob_h.hcrc = gre_in_cksum((u_short *)&mob_h, msiz);
if ((m->m_data - msiz) < m->m_pktdat) {
/* need new mbuf */
MGETHDR(m0, M_NOWAIT, MT_HEADER);
if (m0 == NULL) {
m_freem(m);
error = ENOBUFS;
goto end;
}
m0->m_next = m;
m->m_data += sizeof(struct ip);
m->m_len -= sizeof(struct ip);
m0->m_pkthdr.len = m->m_pkthdr.len + msiz;
m0->m_len = msiz + sizeof(struct ip);
m0->m_data += max_linkhdr;
memcpy(mtod(m0, caddr_t), (caddr_t)ip,
sizeof(struct ip));
m = m0;
} else { /* we have some space left in the old one */
m->m_data -= msiz;
m->m_len += msiz;
m->m_pkthdr.len += msiz;
bcopy(ip, mtod(m, caddr_t),
sizeof(struct ip));
}
ip = mtod(m, struct ip *);
memcpy((caddr_t)(ip + 1), &mob_h, (unsigned)msiz);
ip->ip_len = ntohs(ip->ip_len) + msiz;
} else { /* AF_INET */
m_freem(m);
error = EINVAL;
goto end;
}
} else if (sc->g_proto == IPPROTO_GRE) {
